<template>
  <div class="add">
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="消息提示的文案" type="info" center show-icon> </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab 标签页 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" tab-position="left" stretch :before-leave="tabToggle" @tab-click="tabClick">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
             <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
             <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
             <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <!-- 商品分类 -->
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                expand-trigger="hover"
                :props="cateListProps"
                @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb ,i) in item.attr_vals" :key="i" border>{{ cb }}</el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action: 图片上传到的后台API地址 list-type: 预览的格式是什么 -->
            <el-upload
              :action="actionUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headers"
              :on-success="uploadSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
           <quill-editor v-model="addForm.goods_introduce"></quill-editor>
           <el-button type="primary" class="addButton" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewDialogVisible"
      width="50%">
      <img :src="previwePath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 表单内商品数据
      addForm: {
        goods_name: '',
        goods_price: 1,
        goods_weight: 0,
        goods_number: 1,
        // 级联选择框双向绑定的数组
        goods_cat: [],
        // 存放图片的数组
        pics: [],
        // 商品介绍 绑定到富文本编辑器
        goods_introduce: '',
        // 商品的参数（数组），包含 `动态参数` 和 `静态属性`
        attrs: []
      },
      // 验证规则
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }]

      },
      // 商品分类列表
      cateList: [],
      // 级联选择框的配置对象
      cateListProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数数组
      manyTableDate: [],
      // 静态属性
      onlyTableData: [],
      // 图片上传的 api 后台地址
      actionUrl: 'https://jsonplaceholder.typicode.com/posts/',
      // upload 请求因为不是发的 封装好的ajax 所以需要自己带请求头
      headers: {
        Authorization: sessionStorage.getItem('token')
      },
      // 预览图片地址
      previwePath: '',
      // 图片预览框的显示
      previewDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  beforeRouteLeave (to, from, next) {
    this.$confirm('是否退出当前页?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
        center: true
      })
        .then(() => {
          next()
        })
        .catch(() => {
          next(false)
        })
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类失败')
      console.log(res.data)
      this.cateList = res.data
    },
    // 级联选择器切换时触发的函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
      console.log(this.addForm.goods_cat)
    },
    // 切换标签页时 执行的函数 两个回调参数 activeName 和 activeName
    tabToggle (activeName, oldActiveName) {
      // console.log('即将离开的' + oldActiveName)
      // console.log('即将进入的' + activeName)
      let flag = true
      this.$refs.addFormRef.validate(valid => {
        if (!valid) {
          this.$message.error('请先把基本信息填完整')
          flag = false
        }
        // } else if (activeName - oldActiveName !== 1) {
        //   this.$message.error('请一步一步完成！')
        //   flag = false
        // }
      })
      if (!flag) return false
      // if (this.addForm.goods_cat.length !== 3) {
      //   this.$message.error('请先把基本信息填完')
      //   return false
      // }
    },
    // tab 被选中时触发
    async tabClick () {
      console.log(this.activeIndex)
      // 判断当前所在的 tab
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取参数列表失败')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        })
        this.manyTableDate = res.data
        // console.log(this.manyTableDate)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取属性失败')
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },
    // 图片上传成功后执行的函数 resp 后端返回的数据
    uploadSuccess (resp) {
      console.log(resp)
      this.addForm.pics.push({ pic: resp.data.tmp_path })
      console.log(this.addForm)
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file)
      this.previwePath = file.response.data.url
      this.previewDialogVisible = true
      console.log(this.previwePath)
    },
    // 处理图片预览效果 file 移除的信息
    handleRemove (file) {
      // 拿到图片的路径
      const path = file.response.data.tmp_path
      // 找到数组中这张图片的路径的索引 findIndex 方法
      // 参数是一个函数 x => {} x 代表数组中的每一项 返回满足条件的索引
      const index = this.addForm.pics.findIndex(x => x.pic === path)
      // 通过 splice 方法删除
      // this.addForm.pics.splice(index, 1)
    },
    // 添加商品按钮
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请先填写表单的必填项')
        // 因为级联选择器的v-model 绑定了这个 addForm。goods_cat 必须是数组才可以
        // 当改变了goods_cat 为字符串时 级联选择器的 v-model 不符合数组这个条件就会报错
        // 所以使用 lodash的深克隆来解决这个问题
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理 manyTableData
        this.manyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            // 因为 动态属性 前面转成了数组所以需要变成字符串
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理 静态属性 onlyTableData
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // form.pics = []
        // 发起请求 添加商品
        // 商品名字唯一
        // const { data: res } = await this.$http.post('goods', form)
        // console.log(res)
        // if (res.meta.status !== 201) return this.$message.error(res.meta.msg)
        let data = []
        if (sessionStorage.getItem('good')) {
          data = JSON.parse(sessionStorage.getItem('good'))
        }
        data.push({
          ...form,
          upd_time: (Date.now() + '').substr(0, 10) * 1
        })
        sessionStorage.setItem('good', JSON.stringify(data))
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  }
}
</script>

<style lang='less' scoped>
.el-steps {
  margin: 15px 0;
}
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.addButton {
  margin-top: 15px;
}
</style>
